drm/fbdev: rework output polling to be back in the core. (v4)

After thinking it over a lot it made more sense for the core to deal with
the output polling especially so it can notify X.

v2: drop plans for fake connector - per Michel's comments - fix X patch sent to xorg-devel, add intel polled/hpd setting, add initial nouveau polled/hpd settings.

v3: add config lock take inside polling, add intel/nouveau poll init/fini calls

v4: config lock was a bit agressive, only needed around connector list reading.
otherwise it could re-enter.

glisse: discard drm_helper_hpd_irq_event

v3: Reviewed-by: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index c560364663a5..2e4bf92faa85 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -31,6 +31,7 @@
 #include <linux/idr.h>
 
 #include <linux/fb.h>
+#include <linux/slow-work.h>
 
 struct drm_device;
 struct drm_mode_set;
@@ -460,6 +461,15 @@ enum drm_connector_force {
         DRM_FORCE_ON_DIGITAL, /* for DVI-I use digital connector */
 };
 
+/* should we poll this connector for connects and disconnects */
+/* hot plug detectable */
+#define DRM_CONNECTOR_POLL_HPD (1 << 0)
+/* poll for connections */
+#define DRM_CONNECTOR_POLL_CONNECT (1 << 1)
+/* can cleanly poll for disconnections without flickering the screen */
+/* DACs should rarely do this without a lot of testing */
+#define DRM_CONNECTOR_POLL_DISCONNECT (1 << 2)
+
 /**
  * drm_connector - central DRM connector control structure
  * @crtc: CRTC this connector is currently connected to, NULL if none
@@ -504,6 +514,8 @@ struct drm_connector {
         u32 property_ids[DRM_CONNECTOR_MAX_PROPERTY];
         uint64_t property_values[DRM_CONNECTOR_MAX_PROPERTY];
 
+        uint8_t polled; /* DRM_CONNECTOR_POLL_* */
+
         /* requested DPMS state */
         int dpms;
 
@@ -543,6 +555,7 @@ struct drm_mode_set {
  */
 struct drm_mode_config_funcs {
         struct drm_framebuffer *(*fb_create)(struct drm_device *dev, struct drm_file *file_priv, struct drm_mode_fb_cmd *mode_cmd);
+        void (*output_poll_changed)(struct drm_device *dev);
 };
 
 struct drm_mode_group {
@@ -580,6 +593,10 @@ struct drm_mode_config {
         struct drm_mode_config_funcs *funcs;
         resource_size_t fb_base;
 
+        /* output poll support */
+        bool poll_enabled;
+        struct delayed_slow_work output_poll_slow_work;
+
         /* pointers to standard properties */
         struct list_head property_blob_list;
         struct drm_property *edid_property;